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DSH_BT024-00200_1v4 © Ezurio Ltd 2006
9
RS-232
Port /TXD @ application sends data to the module’s UART_RX signal line
Port /RXD @ application receives data from the module’s UART_TX signal line
Figure 6.1 : UART interfaces
Note that the serial module output is at 3.0V CMOS logic levels. Level conversion must be added to interface with
an RS-232 level compliant interface.
6.1.2
GPIO Port
Eight lines of programmable bi-directional input/outputs (I/O) are provided that can be accessed either via the
UART port, or Over The Air (OTA) from a second
Bluetooth
unit. These can be used as data inputs or to control
external equipment. By using these in OTA mode, an embedded
Bluetooth
Serial module can be used for control
and data acquisition without the need for any additional host processor. A further line can be used as an input.
Each of the GPIO ports can be independently configured to be either an Input or Output. A selection of ports can
be accessed synchronously.
The ports are powered from V
CC
. The mode of these lines can be configured and the lines are accessed via S
Registers in the range 623 to 629.
Low latency I/O can be accessed by using Ezurio’s I/O via an enhanced inquiry process.
6.1.3
PCM CODEC Interface
PCM_OUT, PCM_IN, PCM_CLK and PCM_SYNC carry up to three bi-directional channels of voice data, each at
8ksamples/s. The format of the PCM samples can be 8-bit A-law, 8-bit µ-law, 13-bit linear or 16-bit linear. The
PCM_CLK and PCM_SYNC terminals can be configured as inputs or outputs, depending on whether the module is
the Master or Slave of the PCM interface.
In applications where the PCM master cannot supply a clock signal, the module can be configured to generate a
clock signal on this GPIO: PCM_SLVCLK. Please contact an Ezurio FAE for further details.
The Module is compatible with the Motorola SSI TM interface and interfaces directly to PCM audio devices
including the following:
6.1.3.1
Compatible Codec Chips
•
Qualcomm MSM 3000 series and MSM 5000 series CDMA baseband devices
•
OKI MSM7705 four channel A-law and µ-law CODEC
•
Motorola MC145481 8-bit A-law and µ-law CODEC
•
Motorola MC145483 13-bit linear CODEC